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comparison dwtx/draw2d/FanRouter.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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96:b492ba44e44d 98:95307ad235d9
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.draw2d.FanRouter;
14
15 import dwt.dwthelper.utils;
16
17 import dwtx.draw2d.geometry.Point;
18 import dwtx.draw2d.geometry.PointList;
19 import dwtx.draw2d.geometry.Ray;
20 import dwtx.draw2d.AutomaticRouter;
21 import dwtx.draw2d.PositionConstants;
22
23 /**
24 * Automatic router that spreads its {@link Connection Connections} in a fan-like fashion
25 * upon collision.
26 */
27 public class FanRouter
28 : AutomaticRouter
29 {
30
31 private int separation = 10;
32
33 /**
34 * Returns the separation in pixels between fanned connections.
35 *
36 * @return the separation
37 * @since 2.0
38 */
39 public int getSeparation() {
40 return separation;
41 }
42
43 /**
44 * Modifies a given PointList that collides with some other PointList. The given
45 * <i>index</i> indicates that this it the i<sup>th</sup> PointList in a group of
46 * colliding points.
47 *
48 * @param points the colliding points
49 * @param index the index
50 */
51 protected void handleCollision(PointList points, int index) {
52 Point start = points.getFirstPoint();
53 Point end = points.getLastPoint();
54
55 if (start.opEquals(end))
56 return;
57
58 Point midPoint = new Point((end.x + start.x) / 2, (end.y + start.y) / 2);
59 int position = end.getPosition(start);
60 Ray ray;
61 if (position is PositionConstants.SOUTH || position is PositionConstants.EAST)
62 ray = new Ray(start, end);
63 else
64 ray = new Ray(end, start);
65 double length = ray.length();
66
67 double xSeparation = separation * ray.x / length;
68 double ySeparation = separation * ray.y / length;
69
70 Point bendPoint;
71
72 if (index % 2 is 0) {
73 bendPoint = new Point(
74 midPoint.x + (index / 2) * (-1 * ySeparation),
75 midPoint.y + (index / 2) * xSeparation);
76 } else {
77 bendPoint = new Point(
78 midPoint.x + (index / 2) * ySeparation,
79 midPoint.y + (index / 2) * (-1 * xSeparation));
80 }
81 if (!bendPoint.opEquals(midPoint))
82 points.insertPoint(bendPoint, 1);
83 }
84
85 /**
86 * Sets the colliding {@link Connection Connection's} separation in pixels.
87 *
88 * @param value the separation
89 * @since 2.0
90 */
91 public void setSeparation(int value) {
92 separation = value;
93 }
94
95 }